5th grade Math Vocabulary Words

Definition: Two intersecting lines that form right angles.

• polygon

• perpendicular lines

• acute angle

• intersecting lines

Definition: The number of cubic units it takes to fill a figure.

• perimeter

• area

• volume

• mass

Definition: A portion of a line which starts at a point and goes off in a particular direction to infinity.

• angle

• ray

• plane

• line

Definition: A rectangular solid having six congruent square faces.

• square

• cube

• volume

• pyramid

Definition: The number by which another number is to be divided.

• denominator

• factor

• dividend

• divisor

Definition: has 3 dimensions; having length, width, and height.

• time-division

• space-division

• quadrilateral

• three-dimensional

Definition: A polygon with three sides and three angles.

• triangle

• trapezoid

• pentagon

• rhombus

Definition: A fraction less than one; the numerator is less than the denominator.

• equivalent fractions

• simplest form

• proper fraction

• numerator

Definition: A 3-dimensional figure that has two congruent and parallel faces that are polygons. The remaining faces are parallelograms.

• pyramid

• cube

• prism

• polygon

Definition: A metric unit of length equal to 0.01 of a meter. 100 cm = 1 m.

• gram (g)

• centimeter (cm)

• kilogram (kg)

• meter (m)